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What happens if I touch in with one card and touch out with another on the same journey on the Transport for London (TfL) network?

You could be charged the maximum fare on both cards so make sure you touch in and out with the same card, whether that's your Oyster card, your contactless Barclays debit card, Barclaycard or other bank's contactless card.

Barclays Bank PLC. Authorised by the Prudential Regulation Authority and regulated by the Financial Conduct Authority and the Prudential Regulation Authority (Financial Services Register number: 122702). Barclays Bank PLC adheres to The Standards of Lending Practice which is monitored and enforced by The Lending Standards Board. Further details can be found at www.lendingstandardsboard.org.uk. Barclays Insurance Services Company Limited is authorised and regulated by the Financial Conduct Authority (Financial Services Register number: 312078).